Touch display panel, producing method thereof, and display apparatus

ABSTRACT

The present application provides a touch display panel, a method for producing the same and a display apparatus. The touch display panel includes a liquid crystal screen and a protection cover plate covered at a light exiting side of the liquid crystal screen. The touch display panel further includes a sound elimination membrane, located at the light exiting side of the liquid crystal screen, and configured to eliminate sound waves generated when the touch display panel is touched. With the provision of the sound elimination membrane, the touch display panel can eliminate the vibration sound waves generated during the knocking touch process, and avoid the alignment difference of the liquid crystal molecules by the vibration sound waves, thereby avoiding a display mura caused by the vibration sound waves and further significantly suppressing the display mura generated during the knocking touch process.

CROSS-REFERENCE TO RELATED APPLICATION

This Application is a Section 371 National Stage Application ofInternational Application No. PCT/CN2015/091744, filed 12 Oct. 2015,entitled “TOUCH DISPLAY PANEL, PRODUCING METHOD THEREOF, AND DISPLAYAPPARATUS”, which has not yet published, and which claims priority toChinese Application No. 201510279881.X, filed on 27 May 2015,incorporated herein by reference in their entirety.

BACKGROUND OF THE INVENTION Field of the Invention

The present application relates to the technical field of display, andparticularly, to a touch display panel, a method for producing the sameand a display apparatus.

Description of the Related Art

Currently, a liquid crystal panel having a touch function has been usedwidely. A basis structure of the liquid crystal panel has a protectioncover glass 2 as an outermost layer and a liquid crystal panel 4 as alowest layer, and both of them are completely attached by a transparentoptical adhesive 5 (OCA), as shown in FIG. 1.

When a touch operation of the liquid crystal panel is performed, ittends to lead to touch mura. Such touch mura is generally caused by twokinds of reasons. The first reason is that the liquid crystal panel 4generates a deformation in a thickness direction of a cell upon beingpressed for the touch. Because the deformation happens at localpositions in the thickness direction of the cell (as shown in FIG. 2),difference between alignment of liquid crystal molecules 41 at suchlocal positions and that of liquid crystal molecules 41 at surroundingregions causes the changes of optical path length difference, and thusthe difference of the transmittivity is generated, thereby resulting inthe display mura. The second reason is that when a touch force becomeslarge, for example, being a knocking touch, it will generate vibrationsound waves. The sound waves are conducted to the liquid crystalmolecules 41, so that they also cause the alignment difference, therebycausing the display mura (as shown in FIG. 3), i.e., a dynamic touchmura. A mechanism about the coupling effect of such liquid crystalmolecules with the sound wave plays the most significant role for avertical alignment (VA) type liquid crystal display, than a planerotation type liquid crystal display such as an in plane switching (IPS)type liquid crystal display or a fringe field switching (FFS) typeliquid crystal display.

At present, due to a relatively large stiffness, the protection coverglass (for example Corning Gorilla Glass) can effectively resist thefirst kind of touch mura caused by the deformation in the thicknessdirection of the liquid crystal cell, but the mura generated by toolarge touch force cannot be suppressed significantly. Of course, whenthe thickness of the transparent optical adhesive is increased, a partof the sound waves can be shield off, so as to suppress the muragenerated upon the knocking touch. However, this will bring aboutproblems such as yellow spot or bubbles.

SUMMARY

With regards to the above technical problems existing in the prior art,the present application provides a touch display panel, a method forproducing the same and a display apparatus. With the provision of thesound elimination membrane, the touch display panel can eliminate thevibration sound waves generated during the knocking touch process, andavoid the alignment difference of the liquid crystal molecules due tothe vibration sound waves, thereby avoiding the display mura caused bythe vibration sound waves and further significantly suppressing thedisplay mura generated during the knocking touch process.

An embodiment of the present application provides a touch display panel,including a liquid crystal screen and a protection cover plate coveredat a light exiting side of the liquid crystal screen, wherein

the touch display panel further includes a sound elimination membranelocated at the light exiting side of the liquid crystal screen andconfigured to eliminate sound waves generated when the touch displaypanel is touched.

In one example, the sound elimination membrane includes a base body ofthe membrane and a plurality of holes provided in the base body of themembrane.

In one example, the plurality of holes are identical in terms of sizesand shapes and are evenly distributed.

In one example, the holes include through holes passing through athickness of the base body of the membrane or blind holes provided inthe base body of the membrane.

In one example, an opening size of the holes is in a range of 5-15 μm.

In one example, the holes have a same distributing density as that ofpixels on the touch display panel.

In one example, the shape of the holes includes any of a cone frustum, atruncated pyramid, a cylinder or a prism, or any combination of theseshapes.

In one example, a thickness of the sound elimination membrane is in arange of 20-40 μm.

In one example, the sound elimination membrane is made of aphoto-sensitive resin material which is transparent.

In one example, the liquid crystal screen includes a color filtersubstrate and an array substrate assembled together, wherein the colorfilter substrate is located at a light exiting side of the liquidcrystal screen and the protection cover plate is located at one side ofthe color filter substrate facing away from the array substrate.

In one example, the sound elimination membrane is located between thecolor filter substrate and the protection cover plate.

In one example, the sound elimination membrane is located at one side ofthe color filter substrate facing away from the protection cover plate.

In one example, the color filter substrate includes a substrate and apolarizer provided at one side of the substrate facing away from thearray substrate, and the sound elimination membrane is located betweenthe substrate and the polarizer.

In one example, the sound elimination membrane is located at one side ofthe protection cover plate facing away from the color filter substrate.

In one example, the touch display panel further includes a touch layerprovided onto the array substrate, the color filter substrate or theprotection cover plate.

An embodiment of the present application provides a display apparatus,including the touch display panel as described above.

An embodiment of the present application provides a method for producingthe touch display panel as described above, including a step ofmanufacturing the sound elimination membrane at the light exiting sideof the liquid crystal screen.

In one example, the step of manufacturing the sound elimination membraneat the light exiting side of the liquid crystal screen includes:

forming the sound elimination membrane onto the color filter substrateor the protection cover plate of the liquid crystal screen by a singleexposure process.

In one example, the step of manufacturing the sound elimination membraneat the light exiting side of the liquid crystal screen includes:

forming the sound elimination membrane onto a glass substrate by asingle exposure process, then peeling off the sound elimination membranefrom the glass substrate, and finally attaching the sound eliminationmembrane onto the color filter substrate or the protection cover plateby a transparent optical adhesive.

Advantageous Effect of Present Application

With the provision of the sound elimination membrane, the touch displaypanel provided by the present application can eliminate the vibrationsound waves generated during the knocking touch process, and avoid thealignment difference of the liquid crystal molecules due to thevibration sound waves, thereby avoiding the display mura caused by thevibration sound waves and further significantly suppressing the displaymura generated during the knocking touch process.

With the touch display panel as described above, the display apparatusprovided by the present application significantly suppresses the displaymura generated during the knocking touch process and enhances thedisplay effect thereof.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view for showing a structure of a liquid crystalmodule having a touch function in the prior art;

FIG. 2 is a schematic view for showing an alignment of liquid crystalmolecules inside a liquid crystal panel when a deformation of the liquidcrystal panel is generated in a thickness direction of a cell under apressing effect;

FIG. 3 is a schematic view for showing an alignment of liquid crystalmolecules inside a liquid crystal panel when the liquid crystal panel istouched with a large knocking force;

FIG. 4 is a sectional view for showing a structure of a touch displaypanel in according with a first embodiment of the present application;

FIG. 5 is a schematic view for showing a structure of a soundelimination membrane in FIG. 4;

FIG. 5A is a schematic view for showing a relationship between holes ofthe sound elimination membrane as shown in FIG. 5 and pixels of a touchdisplay panel;

FIG. 6 is a sectional view for showing a structure of a touch displaypanel in accordance with a second embodiment of the present application;

FIG. 7 is a sectional view for showing a structure of a touch displaypanel in accordance with a third embodiment of the present application;

FIG. 8 is a sectional view for showing a structure of a touch displaypanel in accordance with a fourth embodiment of the present application;

FIGS. 9A-9D show a single exposure process in accordance with anembodiment of the present application; and

FIGS. 10A-10F show a single exposure process and a peeling off processin accordance with another embodiment of the present application.

EXPLANATION ABOUT REFERENCE NUMERALS

-   -   1: liquid crystal screen 11: color filter substrate 110:        substrate 111: polarizer 12: array substrate 2: protection cover        plate 3 sound elimination membrane 31: base body of membrane 32:        hole 4: liquid crystal panel 41: liquid crystal molecule 5:        transparent optical adhesive

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to better understand technical solutions of the presentapplication for those skilled in the art, a touch display panel, amethod for producing the same and a display apparatus provided by thepresent application are described in detail with reference to theattached drawings and specific embodiments thereof.

First Embodiment

The present embodiment provides a touch display panel, as shown in FIG.4, which includes a liquid crystal screen 1 and a protection cover plate2 covered at a light exiting side of the liquid crystal screen 1. Thetouch display panel further includes a sound elimination membrane 3,located at the light exiting side of the liquid crystal screen 1. Thesound elimination membrane 3 is used to eliminate the sound wavesgenerated when touching the touch display panel.

In the present embodiment, the liquid crystal screen 1 includes a colorfilter substrate 11 and an array substrate 12 assembled together, andthe color filter substrate 11 is located at a light exiting side of theliquid crystal screen 1. The protection cover plate 2 is located at oneside of the color filter substrate 11 facing away from the arraysubstrate 12, and the sound elimination membrane 3 is located betweenthe color filter substrate 11 and the protection cover plate 2.

The sound elimination membrane 3 is provided so as to eliminatevibration sound waves generated during a knocking touch, and to preventalignment difference of liquid crystal molecules positioned between thecolor filter substrate 11 and the array substrate 12 due to thevibration sound waves, thereby avoiding the display mura caused by thevibration sound waves and significantly suppressing the display muragenerated during the knocking touch.

It should be noted that in the present embodiment, a touch layer of thetouch display panel can be provided on the array substrate 12, the colorfilter substrate 11 or the protection cover plate 2. In other words,there is no limitation on the specific position of the touch layer. Thetouch display panel can be an In cell touch panel (i.e., the touch layeris embedded into liquid crystal pixels), an On cell touch panel (i.e.,the touch layer is embedded between the color filter substrate and thepolarizer), or an OGS touch panel (i.e., the touch layer and theprotection glass cover plate are integrated together).

In the present embodiment, as shown in FIG. 5, the sound eliminationmembrane 3 includes a base body 31 of the membrane and a plurality ofholes 32 provided on the base body 31. The holes 32 are provided so thatvibration sound waves generated during a knocking touch of the touchdisplay panel are eliminated, and alignment differences of liquidcrystal molecules caused due to the vibration sound waves are prevented,thereby avoiding the display mura caused by the vibration sound waveswhen the touch display panel is displaying.

In the present embodiment, the plurality of holes 32 have identicalsizes and shapes from each other, and are evenly distributed. Becausethe vibration sound waves generated upon being knocked are propagatedand diffused uniformly, due to such arrangement, it can improve anelimination effect of the holes 32 to the vibration sound waves, so thatthe vibration sound waves can be eliminated uniformly and completely. Inaddition, the holes 32 arranged uniformly can also enable the soundelimination membrane 3 to transmit light uniformly, so that the soundelimination membrane 3 does not affect the property of transmittinglight uniformly of the touch display panel.

In the present embodiment, the holes 32 are through holes passingthrough entire thickness of the base body 31 of the membrane. It shouldbe noted that the holes 32 can also be blind holes arranged on the basebody 31 of the membrane. Being the through holes or blind holes canfunction to eliminate the vibration sound waves.

The holes 32 have an opening size in a range of 5-15 μm. The openingsizes of the holes 32 are mainly determined depending on wavelengths ofthe vibration sound waves. The holes 32 having such size range canbetter eliminate the vibration sound waves generated by the knocking.

In the present embodiment, as shown in FIG. 5A, the holes 32 have thesame distribution density as that of the pixels on the touch displaypanel, that is the holes 32 as shown have one-to-one distributionrelationship with the pixels P1, P2 . . . P18. The holes 32 having suchdistribution density can facilitate the elimination of the vibrationsound waves generated during the knocking touch, thereby better avoidingthe display mura caused by the vibration sound waves.

In the present embodiment, the holes 32 have a shape of a cone frustum.Of course, the holes 32 can also have the other suitable shapes such asa truncated pyramid, a cylinder or a prism or any combination of theabove shapes.

In the present embodiment, the sound elimination membrane 3 has athickness in a range of 20-40 μm. The sound elimination membrane 3having such thickness can better function to eliminate the vibrationsound waves generated by the knocking.

In the present embodiment, the sound elimination membrane 3 is made of atransparent photo sensitive rein material. Such kind of the soundelimination membrane 3 would not affect the normal light transmittivityof the touch display panel, while eliminating the vibration sound waves.This kind of material enables the sound elimination membrane 3 to bemanufactured by coating, light exposure and development processes only,and thus the manufacturing process thereof is very simple.

The present embodiment also provides a method for producing a touchdisplay panel, including producing a sound elimination membrane at alight exiting side of the liquid crystal screen.

In the present embodiment, the sound elimination membrane is formed ontothe color filter substrate of the liquid crystal screen by exposing itto light once time or a single exposure process. In particular, the basebody 31 of the sound elimination membrane 3 is provided on the colorfilter substrate 11 or the protection cover plate 2 in FIG. 9A, aphoto-resist layer 33 is coated thereon in FIG. 9B and the procedures ofexposing to the light and development are performed to form a pluralityof openings 34 in FIG. 9C. After that, the etching process is done toform the holes 32 in FIG. 9D.

It should be noted that the sound elimination membrane in the presentembodiment can also be formed on the protection cover plate by exposingit to light once time or a single exposure process. Alternatively, thesound elimination membrane is formed on the glass substrate by exposingit to light once time or a single exposure process, then the soundelimination membrane is peeled off from the glass substrate, andfinally, it is attached onto the color filter substrate or theprotection cover plate by a transparent optical adhesive. In particular,the base body 31 of the sound elimination membrane 3 is provided on aglass substrate 20 in FIG. 10A, a photo-resist layer 33 is coatedthereon in FIG. 10B and the procedures of exposing to the light anddevelopment are performed to form a plurality of openings 34 in FIG.10C. After that, the etching process is done to form the holes 32 inFIG. 10D. Then, the resulting sound elimination membrane 3 is peeled offin FIG. 10E and attached onto the color filter substrate 11 or theprotection cover plate 2 by the transparent optical adhesive in FIG.10F.

Second Embodiment

This embodiment provides a touch display panel. As shown in FIG. 6, thesound elimination membrane 3 is located at one side of the color filtersubstrate 11 facing away from the protection cover plate 2, which isdifferent from that of the first embodiment.

In the present embodiment, the sound elimination membrane 3 is providedon the color filer substrate 11. With such arrangement, it can ensurethe vibration sound waves generated by the knocking do not pass into theliquid crystal molecules, thereby avoiding the display mura of the touchdisplay panel caused by the vibration sound waves.

Other structure arrangements of the touch display panel in the presentembodiment and the producing method thereof are identical with those asdescribed in the first embodiment, and thus they are not repeatedlydiscussed herein.

Third Embodiment

This embodiment provides a touch display panel. As shown in FIG. 7, thecolor filter substrate 11 includes a substrate 110 and a polarizer 111provided at the side of the substrate 110 facing away from the arraysubstrate 12, and the sound elimination membrane 3 is located betweenthe substrate 110 and the polarizer 111, which is different from thoseof the first embodiment and the second embodiment.

With such arrangement, it can ensure the vibration sound waves generatedby the knocking do not pass into the liquid crystal molecules, therebyavoiding the display mura of the touch display panel caused by thevibration sound waves.

Other structure arrangements of the touch display panel in the presentembodiment and the producing method thereof are identical with those asdescribed in the first embodiment or the second embodiment, and thusthey are not repeatedly discussed herein.

Fourth Embodiment

This embodiment provides a touch display panel. As shown in FIG. 8, thesound elimination membrane 3 is located at one side of the protectioncover plate 2 facing away from the color filter substrate 11.

With such arrangement, it can ensure the vibration sound waves generatedby the knocking do not pass into the liquid crystal molecules, therebyavoiding the display mura of the touch display panel caused by thevibration sound waves.

Other structure arrangements of the touch display panel in the presentembodiment and the producing method thereof are identical with those asdescribed in any of the first embodiment, the second embodiment and thethird embodiment, and thus they are not repeatedly discussed herein.

Advantageous Effect of the First to Fourth Embodiments

With the provision of the sound elimination membrane, the touch displaypanel provided by the first to fourth embodiments of the presentapplication can eliminate the vibration sound waves generated during theknocking touch process, and avoid the alignment difference of the liquidcrystal molecules due to the vibration sound waves, thereby avoiding thedisplay mura caused by the vibration sound waves and furthersignificantly improving the display mura generated during the knockingtouch process.

Fifth Embodiment

The present embodiment provides a display apparatus, including a touchdisplay panel as described in any of the first to fourth embodiments.

With the touch display panel as described in any of the first to fourthembodiments, the display apparatus significantly suppresses the displaymura generated during the knocking touch process and enhances thedisplay effect thereof.

It should be understood that the above embodiments are only intended tointerpret the principle of the present application and used as only theillustrative examples. However, the present application is not limitedto this. As for those skilled in the art, various modifications andchanges may be made to the present disclosure without departing from theprinciples and spirit of the present application. As such, thesemodifications and changes to the present application are also intendedto be included within the scope of the present application.

What is claimed is:
 1. A touch display panel, comprising a liquidcrystal screen and a protection cover plate covered at a light exitingside of the liquid crystal screen, wherein the touch display panelfurther comprises a sound elimination membrane located at the lightexiting side of the liquid crystal screen and configured to eliminatesound waves generated when the touch display panel is touched, whereinthe sound elimination membrane comprises a base body of the membrane anda plurality of holes provided in the base body of the membrane, whereinthe holes have a same distributing density as that of pixels on thetouch display panel, so that the holes have one-to-one distributionrelationship with the pixels.
 2. The touch display panel as claimed inclaim 1, wherein the plurality of holes are identical in terms of sizesand shapes and are evenly distributed.
 3. The touch display panel asclaimed in claim 1, wherein the holes comprise through holes passingthrough a thickness of the base body of the membrane or blind holesprovided in the base body of the membrane.
 4. The touch display panel asclaimed in claim 1, wherein an opening size of the holes is in a rangeof 5-15 μm.
 5. The touch display panel as claimed in claim 1, whereinthe shape of the holes comprises any of a cone frustum, a truncatedpyramid, a cylinder or a prism, or any combination of these shapes. 6.The touch display panel as claimed in claim 1, wherein a thickness ofthe sound elimination membrane is in a range of 20-40 μm.
 7. The touchdisplay panel as claimed in claim 1, wherein the sound eliminationmembrane is made of a photo-sensitive resin material which istransparent.
 8. The touch display panel as claimed in claim 1, whereinthe liquid crystal screen comprises a color filter substrate and anarray substrate assembled together, wherein the color filter substrateis located at the light exiting side of the liquid crystal screen andthe protection cover plate is located at one side of the color filtersubstrate facing away from the array substrate.
 9. The touch displaypanel as claimed in claim 8, wherein the sound elimination membrane islocated between the color filter substrate and the protection coverplate.
 10. The touch display panel as claimed in claim 8, wherein thesound elimination membrane is located at one side of the color filtersubstrate facing away from the protection cover plate.
 11. The touchdisplay panel as claimed in claim 8, wherein the color filter substratecomprises a substrate and a polarizer provided at one side of thesubstrate facing away from the array substrate, and the soundelimination membrane is located between the substrate and the polarizer.12. The touch display panel as claimed in claim 8, wherein the soundelimination membrane is located at one side of the protection coverplate facing away from the color filter substrate.
 13. The touch displaypanel as claimed in claim 8, further comprising a touch layer providedonto the array substrate, the color filter substrate or the protectioncover plate.
 14. A display apparatus, comprising the touch display panelas claimed in claim
 1. 15. A method for producing the touch displaypanel as claimed in claim 1, comprising a step of manufacturing thesound elimination membrane at the light exiting side of the liquidcrystal screen.
 16. The method as claimed in claim 15, wherein the stepof manufacturing the sound elimination membrane at the light exitingside of the liquid crystal screen comprises: forming the soundelimination membrane onto the color filter substrate or the protectioncover plate of the liquid crystal screen by a single exposure process.17. The method as claimed in claim 15, wherein the step of manufacturingthe sound elimination membrane at the light exiting side of the liquidcrystal screen comprises: forming the sound elimination membrane onto aglass substrate by a single exposure process, then peeling off the soundelimination membrane from the glass substrate, and finally attaching thesound elimination membrane onto the color filter substrate or theprotection cover plate by a transparent optical adhesive.